Invasion of Astro-Monster (known in Japan as The Great Monster War (怪獣大戦争 Kaijū Daisensō?); is a Japanese/American Science Fiction kaiju film released in 1965. The film was co-produced between the Japanese company Toho, and Henry G. Saperstein's American company UPA, marking the only time a Godzilla film was co-produced with an American studio. Directed by Ishirō Honda, and featuring special effects by Eiji Tsuburaya, the film starred Hollywood actor Nick Adams, alongside Japanese actors Akira Takarada, Kumi Mizuno and Akira Kubo. The 6th film in the Godzilla series, this was also the first film to feature alien invaders, combining the series with outer space themes, such as civilizations on other planets and interplanetary space travel.